Nuclear analogs of β-lactam antibiotics. XIX. Syntheses of racemic and enantiomeric p-nitrobenzyl carbapen-2-em-3-carboxylates
作者:Yasutsugu Ueda、Christopher E. Damas、Vivianne Vinet
DOI:10.1139/v83-391
日期:1983.10.1
Racemic and enantiomeric p-nitrobenzyl carbapen-2-em-3-carboxylates 3, 3a, and 3b were prepared starting from inexpensive sorbic acid through the key intermediates, azetidinone esters 4, thus establishing a total synthesis of the p-nitrobenzylester of a natural product SQ 27,860. Optical resolution was achieved readily on azetidinone menthyl esters, 12. The absoluteconfigurations were also established